Blades of Iron

 is a quest in Tyranny.

Synopsis
Graven Ashe has sent you to Lethian's Crossing ensure the Forge-Bound are protected and can continue making weapons for the Disfavored.

Walkthrough

 * Head to Lethian's Crossing to meet Zdenya, Master of the Forge. If it's under Scarlet Chorus or Bronze Brotherhood control, wipe out the garrison. Once the garrison is gone, you can then interact with the inhabitants.
 * Zdenya can be found in the Forge-Bound foundry, known simply as the Forge. It's located east of the river on the first tier of the Moonrise District, just above the ground floor.
 * Zdenya will ask you to join her on the third tier of Lethian's Crossing where she will place the Magebane Helm before discussing the future of the Forge-Bound.
 * Once the placement is done, Eldian will ask you to confirm that the Magebane Helm actually works by entering the Oldwalls at Lethian's Crossing and watching for loose Bane. You will receive a keystone to enter (note that with Lore 55, you can point out that Kyros' law forbids actually entering the Oldwalls, but that you'll do it for the Crossing ).
 * Enter the Oldwalls using the keystone. See Lethian's Crossing Oldwalls - Antechamber for area details. For now, approach the area in front of your party. Something goes wrong and you're attacked by Bane. Return outside to Zdenya.
 * Of course, nothing's as simple as that. Iron and Blood begins and your goal is to fight through the Bronzemen. The quest completes as soon as you give chase to Raetommon.